He stood there, head back, framed against the blue sky.
他站在那里,头向后仰,衬托在蓝天下。
Max threw back his head and roared with laughter.
马克斯把头向后一甩,哄然大笑。
Mari tilted her head back so that she could look at him.
玛丽把头向后仰了仰,以便能看着他。
A thick mane grows from the top of the head and down the back of the neck.
VOA: special.2010.06.22
And the head you are seeing at the back there he was trying to touch is his wife's face.
他用手于去触摸的那个人,是他的妻子。
But when we're thinking about actual wave behavior of electrons, it's just important to keep in the back of our head that some areas have positive amplitude and some have negative.
电子的波动行为时,我们,要记住,某些地方是正的,某些地方是负的,当我们讲到。
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